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In this equation, G is Newton s universal gravitational constant, M is the mass of the black hole, and c is the speed of light The edge of the sphere defined by the Schwarzschild radius is called the event horizon At the event horizon, the escape velocity equals the speed of light Because nothing travels faster than the speed of light, objects that cross the event horizon can never escape

Kepler s first law states that planets move in elliptical orbits, with the Sun at one focus Kepler s second law states that an imaginary line from the Sun to a planet sweeps out equal areas in equal times Kepler s third law states that the square of the ratio of the periods of any two planets is equal to the cube of the ratio of their distances from the Sun

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Newton s law of universal gravitation states that the gravitational force between any two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers The force is attractive and along a line connecting their centers F G

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Newton s law of universal gravitation can be used to rewrite Kepler s third law to relate the radius and period of a planet to the mass of the Sun T2